Total hydrocarbon analysis control system and control method for oxygen generation

Abstract

The invention provides a total hydrocarbon analysis control system and control method for oxygen generation. The control system is composed of an oxygen generator system, an analysis system and a DSCsystem. The oxygen generator system consists of a first air separation unit and a second air separation unit, a third air separation unit and a liquid oxygen tank. The analysis system consists of a first analysis channel, a second analysis channel, a third analysis channel, and a hot standby analysis channel. And the DSC system includes a control unit. Besides, the control method comprises: S1, injecting combustion air; S2, injecting combustion hydrogen; S3, injecting total hydrocarbon sample gas; S4, operating a total hydrocarbon analysis meter; and S5, analyzing and controlling a total hydrocarbon content of the oxygen generator system. Compared with the prior art, the control system and control method have the following beneficial effects: when any air separation analyzer or other unitcomponent has a fault problem or is damaged or the analyzer is in an off-line state because of checking and maintenance, the total hydrocarbon content of the corresponding air separation unit can be monitored continuously, so that an explosion risk caused by excessive accumulation of total hydrocarbons in air separation is avoided.

Description

technical field [0001] The technology relates to the field of cryogenic oxygen production, in particular to a system and method for analyzing and controlling the total hydrocarbon content in the liquid oxygen of an oxygen generator. Background technique [0002] The oxygen generator using cryogenic technology uses air as raw material, after compression, pre-cooling, and purification treatment, deep cooling and rectification are carried out in the air separation unit to separate the components in the air, thereby producing the corresponding Oxygen, nitrogen, argon and other gas (liquid) products. In the liquid oxygen separated by air, it contains acetylene, methane, ethane, propane, ethylene, propylene and other hydrocarbons (referred to as "total hydrocarbons" or "total hydrocarbons"), these substances are combustible substances, when the total When the hydrocarbon content reaches saturation, it will be precipitated in the form of particles, and will explode when rubbed in ...

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the high-temperature heating inside the analyzer, the parts are easy to deteriorate and malfunction; however, only one analyzer is equipped with one air separation unit. When there is a failure or damage, the total hydrocarbon monitoring of the air separation unit is forced to be interrupted and out of control

[0006] (2) Combustion hydrogen is supplied by outsourced steel cylinder hydrogen. Due to the single equipment and when the cylinder gas is exhausted and the supply is cut off, the analyzer will turn off and stop working, which also causes the total hydrocarbon monitoring to be interrupted.

[0007] (3) The combustion air comes from the raw material air produced by the oxygen generator itself, and is remotely connected from the air separation site through pipelines. When the air separation is shut down, the air supply will be cut off. At this time, the liquid oxygen in the air separation has not been exhausted, and the The total hydrocarbons need to be monitored, but the analyzer has been turned off and stopped working due to the loss of air supply

[0008] (4) The analyzer needs regular calibration and routine maintenance. During the calibration and maintenance, the analyzer will be offline or off the machine, so it is forced to leave the monitoring of total hydrocarbons in air separation

[0009] (5) After any of the above situations occurs, it will take a certain amount of time to recover from the treatment; during this period, there is a lack of control due to loss of monitoring, resulting in an abnormal increase in the total carbon and hydrogen in the air separation, which brings the risk of explosion

[0010] (6) The total hydrocarbon analyzer is a Class A (key) equipment, which requires rapid recovery after a failure, so the method of stocking accidents is generally adopted. Due to the large number of oxygen generators, the cost of spare parts is relatively high

[0011] (7) The total hydrocarbon analysis method is basically similar to conventional gas analysis. It is an open-loop system and is only used for monitoring; when the equipment fails or is abnormal, it cannot be remotely intervened, which prolongs the failure time and increases the risk of failure

The hydrocarbon analyzer itself has the function of independently displaying the display signals of the two sets of devices, which effectively taps the potential of the analysis device, so that the device can analyze the main cooling of the two sets of oxygen generating devices at the same time, and achieves the improvement of oxygen production efficiency. However, in this patent, when the analyzer fails, the hydrocarbons of the two oxygen generators cannot be analyzed and monitored, and the display channel needs to be switched, and the two oxygen generators cannot be continuously monitored at the same time. There is no solution to the problem of continuous supply of gas source for instrument work

Chinese patent CN201120379179.8 discloses a hydrocarbon analysis device, the patent aims to solve the problem of inconvenience caused by the unidirectional flow path device to the measurement

The working gas source supply device of the utility model hydrocarbon analyzer can continuously and uninterruptedly provide high-quality working gas source to the analyzer, which improves the measurement continuity, accuracy and stability of the instrument. The working gas in the patent The source supply device is configured in one-to-one correspondence with the hydrocarbon analyzer and its air separation, which can continuously provide working air sources when the air separation is in normal operation, but when the corresponding air separation is shut down, the air will be interrupted, causing the corresponding analyzer to In addition, this technology only provides a working gas source for the corresponding analyzer, and cannot solve the problem of interruption of air separation hydrocarbon monitoring caused by analyzer or sample gas failure, nor can it solve the problem of other non-corresponding air Hydrocarbon Monitoring Issues for Sub-units

Images